Recovery of enlarged olefin metathesis catalysts by nanofiltration in an eco-friendly solvent.
This study was aimed at integrating a green separation process without phase change, namely nanofiltration, with olefin metathesis to recover the homogeneous catalyst. As the commercially available Hoveyda II catalyst was not sufficiently retained by the membrane, a set of homogeneous ruthenium-based catalysts were prepared to enhance the recovery of the catalyst by solvent-resistant commercial membranes made of polyimide (Starmem 228). The molecular weights of the catalysts were gradually increased from 627 to 2195 g mol(-1), and recovery was found to increase from around 70 % to 90 % both in toluene and dimethyl carbonate. The most retained catalyst was then engaged in a series of model ring-closing metathesis reactions associated to a final nanofiltration step to recover and recycle the catalyst. Up to five cycles could be performed before a deterioration in the performance of the process was observed.
Keraani
Adel
A
CNRS - UMR Sciences Chimiques de Rennes, Université Rennes 1, Equipe Chimie et Ingénierie des Procédés, 263 avenue du général Leclerc, CS 74205, Bâtiment 10A, Case 1011, 35042 Rennes cedex, France.
Renouard
Thierry
T
Fischmeister
Cédric
C
Bruneau
Christian
C
Rabiller-Baudry
Murielle
M
D000475:Alkenes / Q000737:chemistry*; D002384:Catalysis; D005374:Filtration / Q000379:methods*; D005561:Formates / Q000737:chemistry; D055772:Green Chemistry Technology / Q000379:methods*; D008567:Membranes, Artificial; D036103:Nanotechnology; D012997:Solvents / Q000737:chemistry*; D014050:Toluene / Q000737:chemistry
D000475:Alkenes; D005561:Formates; D008567:Membranes, Artificial; D012997:Solvents; D014050:Toluene; C023025:methyl carbonate